That's what Voltaire said on tolerance:
***** ...Madmen, who have never been able to give worship to the God who made you! Miscreants, whom the example of the Noachides, the learned Chinese, the Parsees and all the sages, has never been able to lead! Monsters, who need superstitions as crows' gizzards need carrion! You have been told it already, and there is nothing else to tell you -- if you have two religions in your countries, they will cut each other's throat; if you have thirty religions, they will dwell in peace. Look at the great Turk, he governs Guebres, Banians, Creek Christians, Nestorians, Romans. The first who tried to stir up tumult would be impaled; and everyone is tranquil.
Of all religions, the Christian is without doubt the one which should inspire tolerance most, although up to now the Christians have been the most intolerant of all men. The Christian Church was divided in its cradle, and was divided even in the persecutions which under the first emperors it sometimes endured. Often the martyr was regarded as an apostate by his brethren, and the Carpocratian Christian expired beneath the sword of the Roman executioners, excommunicated by the Ebionite Christian, the which Ebionite was anathema to the Sabellian....